Improvement in throttle-valves



n. SCHEIDLER & 1. H. McNAMAR.

I Throttle-Valve.- No'. 164,219. P'atentedlun8,l875.

. In O v THE GRAPHIC C0.PH 0T0 -LITH.39 & 41 PARK PLACE N.Y.

UNITED STATES PATENT OFFICE REINHARD SOHEIDLER AND JOHN H. MGNAMAR, OFNEWARK, OHIO.

IMPROVEMENT IN THROTTLE-VALVES.

Specification forming part of Letters Patent No. 164,219, dated J nne 8,1875; application filed March 29, 1875.

To all whom it may concern:

Be it known that we, REINHARD ScHEID- LER and JOHN H. MCNAMAR, ofNewark, in the county of Licking and State of Ohio, have invented a newand useful Improvement in Valves for Regulating Saw-Mill Steam-Em gines,of which the following is a specification:

The object of this invention is to enable the attendant to control theaction of the engine in sawing lumber in steam saw-mills, and forregulating other steam machinery and it consists of a valve which iscontrolled by the sawyer by means of a sector-lever and rack placed inthe steam-pipe, either in combination with or separate from athrottle-valve.

In the accompanying drawing, Figure 1 is a vertical section of acombined throttle and regulating-valve, taken on the line a; :r of Fig.2. Fig. 2 is a vertical section of Fig. 1, taken on the line g y,showing the throttle-valve. Fig. 3 is a horizontal section of Fig. 1,taken on the line 2 2. Fig. 4 is a horizontal section of Fig. 1, takenon the line '11 o, looking down.

Similar letters of reference indicate corresponding parts.

In this example of our invention we show the regulating-valve and thethrottle-valve combined but they may be separated, and theregulating-valve may be used without the throttle-valve, if desired.

A represents the shell or casting. B is the throttle-valve. O is the rodthereof, which works through a stuffing-box, and is opened and closed bymeans of a screw and handwheel, D. E is the regulating-valve on the stemF. G are fingers, four, (more or less.) which extend down below the seatH. The openings I between the fingers are archshaped, and allow thesteam to escape from the valve-chamber J to the engine at the top of thearches, so that as the valve is raised the quantity of steam isincreased in volume. K is a bar of peculiar form, which connects two ofthe fingers at the lower end. The lower side of this bar is beveled toan edge, and at the center is a point, L. (See Fig. 1.) The upper sideis flat, to receive the downward pressure of the steam to close thevalve. This valve is raised by means of a rack, m, on the upper part ofthe valve-stem and the sector N, which is attached to or cast with thelever O. P is an adjustable screw, by which the downward movement of thesector is stopped. This screw is adjustable to give the valve more orless movement, as may be desired. A rod or cord attached to the lever O,which extends to and is under the control of the sawyer, so that he canat any time regulate the motion of the engine. When the engine startsthe throttle-valve is opened wide, so as to allow the full volume ofsteam to reach the regulating-valve. By this means the sawyer orattendant is enabled to completely regulate the movement of the engine,and in sawing to gig back the carriage slow or fast, or bring the engineto a full stop. The butterfly-valve has usually been employed for thispurpose, but such valves become uncontrollable and soon wear out. Ourvalve is durable, and perfectly answers the purpose.

Having thus described our invention, we claim as new and desire tosecure by Letters Patentl. The combination of the valve E, havingfingers G and arched openings I, the stem F, having rack M, the sectorN, stop P,and lever 0, substantially as and for the purpose described.

2. In combination with the v'alve E, the bar K, substantially asdescribed.

3. In combination with the sector N, the adjustable screw P, for thepurposes described.

Witnesses:

JOEL M. DENNIS, EnsoN B. DENNIS.

